100 percent crop on tree branches

This shot of trees silhouetted against a bright overcast sky shows the lens' sharpness and lack of chromatic aberration when you pixel peep at the cropped portion of the shot, below. 1/100sec, f8, 97mm
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100 percent crop at 200mm, f2.8

Wide open, the lens is sharp, too. The sun is fuzzy from atmospheric distortion, but the crop shows the water ripples to be sharp in sunrise shot. Note also the lack of flare despite shooting directly into the sun; in other circumstances, the lens produces flare, however. 1/2000sec, f2.8, 200mm
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Sigma APO 70-200mm F2.8 EX DG OS HSM

The Sigma APO 70-200mm F2.8 EX DG OS HSM comes with a petal-shaped lens hood and removable tripod mount, and though it's not bulkier than other f2.8 lenses of this zoom range, it's not small.
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